Fuel-saving construction for furnaces.



L. C. ZWERDLING.

FUEL SAVING CONSTRUCTION FOR FURNACES.

APPLICATION FILED NOV.10, 1914.

Patented Mar. 16, 1915.

5% Jc C Louis Zwer'dling, "mm

@IATES UFFICE,

LOUIS C. ZWERDLING, OF BROOKLYN, NEW YORK, ASSIGNOR OF ONE-THIRD TO HARRY ZWERDLING AND ONE-THIRD TO JOSEPH JOSEPI-ISON, BOTH OF NEW YORK, N. Y.

FUEL-SAVING CONSTRUCTION FOR FURNACES.

Specification of Letters Patent.

Patented Mar. 16, 1915.

Application filed November 10, 191%. Serial No. 871,241.

To aZZ whom it may concern Be it known that 1, Louis C. ZWERDLING, a citizen of the United States, and residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Fuel- Saving Construction for Furnaces, of which the following is a specification, such as will enable those skilled in the art to which it appertains to make and use the same.

This invention relates to steam boilers and furnaces, and the object thereof is to provide improved means for saving fuel and which will also act, to an extent, as a smoke consumer, and with this and other objects in view the invention consists in the application to the escape flue of a furnace or boiler and adjacent thereto of means by which air, preferably heated, is directed into the furnace or the fire tubes of the boiler around the walls of the escape flue, or a part thereof, and by means of which the escape of carbonaceous gases and similar substances through the escape flue is prevented or retarded, and a more perfect combustion secured.

The invention is fully disclosed in the following specification, of which the accompanying drawing forms a part, in which the separate parts of my improvement are designated by suitable reference characters in each of the views, and in which Figure l is a sectional view of a steam boiler furnace and showing one form of my improvement in which the escape flue of the boiler or furnace is arranged vertically; Fig. 2 a section on the line 22 of Fig. 1; Fig. 8 a section on the line 33 of Fig. 1; and, f a view similar to Fig. 1 but showing a modification.

In the drawing forming part of this specification, I have shown at a a boiler furnace involving a firebox a and in the top portion of which is placed a boiler 6 having horizontal fire tubes Z2 and in the use of this boiler hot gases of combustion pass backwardly through the firebox then forwardly beneath the boiler and then backwardly through the fire tubes Z)? of the boiler and into and through the escape flue c which is provided with a connection 0 with the boiler which incloses the discharged ends of the fire tubes 6 and the above given direction of the products of combustion is indicated by the arrows at. All these features of construction are old and wellknown, and in the practice of my invention as shown in Fig. l, I provide the escape flue 0 adjacent to its connection 0 with a cylindrical enlargement 0 having inwardly directed and tapered top and bottom ends 0 and c and within one side of the annular enlargement c is placed a vertically arranged casing (Z, the lower end of which is preferably inclined downwardly and bachwardly as shown at (Z and perforated, and the upper end of which is open as shown at (Z and mounted in the opening (Z is a fan wheel The casing (Z forms a vertical chamber (Z in one side of the enlarged portion 0 of the flue c, and placed in the upper end of said chamber, in the construction shown, is a curved buffer plate (Z and said chamber is also provided below the wheel 6, in the construction shown, with a transverse partition (Z having a tubular passage d and below which are bafl'le plates or devices (Z d and d arranged as shown in Figs. 1, 2 and 4, and the object of which is to retard the passage of air or of air and the products of combustion downwardly through the chamber (Z The chamber (Z is also provided on its outer side with an air inlet (Z which communicates therewith below the partition plate (Z and in the operation of this device fresh air enters the chamber (Z at and the products of combustion passing through the line 0, as indicated by the arrows a turn the wheel 6 in the direction of the arrow ar and this creates a draft downwardly through the chamber (Z and the air is discharged from the bottom of said chamber as indicated by the arrows 03 and this air is discharged into the hot gases of combustion passing upwardly through the flue c, and this air is highly heated and there is also mingled therewith by the wheel 6 a small amount of products of combustion passing upwardly through the flue c and the result thereof is to retard the flow of partially consumed gases or carbonaceous substances from the boiler or from the furnace and through the escape flue and to hold the same in the furnace, or in the boiler tubes, until they are more completely consumed, and in this Way a saving of fuel is effected, and as will be understood the heavy discharge of black and carbonaceous sub stances from the escape flue is modified and I reduced to a considerable extent.

flue c is of the same size throughout and the casing (Z and the chamber (Z formed thereby are placed on the outer side of said flue,

and instead of having perforations in the lower end 'of the wall cZ of the casing d, as shown in Fig. 1, perforations f are formed in the flue c at the lower end of the chamber 6Z and ashield-g isemployed which directs the air currents passing downwardly from the chamber 41 in a downward direction, as clearly indicated with the arrow a The other features of construction shown in Fig. I

4, and involving the air inlet d, the wheel 6 J and the baflie plates ordevices elf, 0Z (Z etc., in the chamber d are the same as in Figs. 1, Qand 3 and the operation of this form of. device'will also be similar to that shown in Figs. 1 to 3 inclusive, and hereinbefore described. I

It will be understood, of course, thatthe casing d or the chamber ol 'may be made of tions of the construction herein described any desired dimensions longitudinally and transversely, and changes in and modificamay be made within the scope of the ap pended claims, without departing from-the spirit of my invention or sacrificing its advantages. Y

I am aware that devicesor constructions of the same general character as that described and claimed herein have heretofore been applied to the escape flues of boilers and furnaces, but the'distinctive features of my improvement are found in the fact that the fresh air supplied in the manner described is heated before it is discharged into the bottom of the escape flue, or the furnace connection, and in the further fact that there is a forced circulation of the air through the chamber 614, the wheel '6 being automatically operated at all times by the products of combustion passing through the flue'c after escaping from the furnace or the tubes of the boiler. I v

In the accompanying drawing, .I have shown my improvement applied to a v'ertically arranged flue but it will be understood Copies of this patentmay be obtained for that the same may be applied to a flue arranged in ahorizontalposition.

Having any described. my iiivmzi'on, what I claim as new and desire to secure by Letters Patent, is

1. The combination with the escape flue of a boiler furnace, of a casing connected V with onefside portion of said flue adjacent to said furnace and forming an air chamber or passage, the walls'of said chamber or passage being provided atthe end portion thereof adjacent to the furnace with means for discharging air into the escape flue and adjacent. to the opposite end thereof with an air inlet, and said casing bieingjalso pro vided in the end portion thereof opposite the furnace connection with an opening communicating with the .escape flue and a fan wheel mounted therein and adapted to be rotated by the product'sof combustion passing throughthe flue.. 7 V

2. The comb'nation with the escape flue of a boiler furnace, ofa casing connected with one side portionof said flue adjacent to saidfurnace and forming an air chamber or passage, the wallsof said chamber or passage being provided at the end portion thereof adjacent tothe furnace with means for discharging air intothe escape flue and adjacent to the opposite end thereof with an air inlet, and said casing being'also provided inthe end portion thereof opposite the furnace connection with an opening communicating with the escape flue, and a fan wheel mounted" therein and" adapted to be rotated by the products of combustion passing through the flue, and means for retarding the passage of air through said cas ing.

of a furnace with'rneans forsupplying air thereto, comprising a" casing connected wlth one sidethereof andinto which air is fed atone end and fromwliich air isdischarged into the flue at the opposite end, means operated by the products of combustion pass ing through said flue for forcing air through said casing, and mean'swithin said casing for retarding the: passage of air thereth'rough.

In testlmony thatI claim the foregoing as -my invention I have signed my name in- 3. The combination withthejescape flue presence of the subscribing witnesses this 31st day of Qct ober 1914:. i V flours GJZWER LING.

Witnesses C. MULnnANr, 7 H. J. THOMPSON. I

five cents each, by a.ddressing the Commissioner of Patents,

Washington, D. 0. 

